Writing instrument



Dec. 13, 1960 J. M. KAHN ETAL WRITING INSTRUMENT Filed April 5, 195e F lG'.

INVENTORS.

JULIUS M. KAHN ATTORNEY MORRIS LEVY BY, gvwvl f wNIH FIG.6

nited States Patent WRITING INSTRUMENT Julius M. Kahn, Englewood, andMorris Levy, Teaneck, NJ., assignors to David Kahn, Inc., North Bergen,NJ., a corporation of New Jersey Filed Apr. 5, 1956, Ser. No. 576,357

14 Claims. (Cl. 12th-45.4)

The present invention relates to improvements in Writing instruments andmore particularly to writing instruments in which a liquid writingmedium or ink is supplied in a separate container so as to constitute areplaceable cartridge.

The present invention has as its purpose the provision of a novel andsimplied pen construction adapted for mass production which assures easyand reliable replacement of the cartridge without undesirable leakageand consequent mess while at the same time providing an ink feedmechanism which insures the uniform supply of ink to the nib of the penwithout danger of flooding.

In accordance with the invention, the pen section is provided with atubular piercing extension and the feed bar is provided with a reduceddiameter rearwardly extending portion formed with longitudinallyextending grooves therein with the grooved extension being fitted withinthe tubular piercing extension so that the rearwardly extending portionof the feed bar will not interfere with the connecting and disconnectingoperations whereby the cartridge may be easily and reliably replaced andso that an elective capillary feed channel is provided between thegrooved portion of the exterior of the rearwardly extending portion ofthe feed bar and the interior of the tubular piercing extension wherebycontrol of the ink supply and prevention of flooding is enabled.

More particularly, the pen section and its extension are constituted bya single molded piece and the feed bar and its rearwardly projectingportion are also constituted by a single molded piece and the two aresimply fitted together with the nib of the pen therebetween to provide apen assembly unit which is simply screw-propelled into the cartridge toeect a connection therebetween. More specifically, the aforesaid unit isprovided with threads and the aforementioned extensions are positionedcentrally thereof and the cartridge is placed Within a barrel having athreaded forward end so that the unit and cartridge lare connectedtogether simultaneously with the assembling of the unit and barrel.Disassembly of the uint and barrel is not accompanied by disconnectionof the unit and cartridge so that the cartridge may herextracted fromthe barrel to facilitate the eventual disposition thereof withoutundesirable mess.

An object of the invention is the provision of a writing instrumentadapted to be supplied with liquid writing medium contained in acartridge which simultaneously assures ease and reliability in thereplacement of the cartridge and controlled ink supply preventingflooding.

Another object of the invention is the provision of la novel unitary penassembly including a pen section land a feed bar which are interrelatedto enable leakage free connection with a pierceable cartridge andsimultaneously provide an effective and continuous capillary ink feedfrom the cartridge to the vforward portion of the feed bar `adjacent thenib of the pen.

A further object of the invention is the provision of a novel feed barhaving a reduced diameter rearwardly extending portion, the feed barbeing provided with at least one longitudinal groove extendingcontinuously from the rear portion of the extension to the forwardportion of the feed bar.

Still another object of the invention is the provision ice of a writinginstrument adapted to be supplied with liquid writing medium containedin a preferred cartridge adapted to be replaced when the liquid therein'is 'exhausted in Which the cartridge and barrel receiving the same arecontigurated to assure proper insertion ofthe cartridge in the barrel.

It is also an'object of the invention'to provide a 'preformed cartridgecontaining means adapted torinsure the capillary flow of liquid writingmedium from Vthe cartridge.

Still another object of the invention is the provision Vof a reservoirintermediate the capillary feed within the pen section to insure theimmediate availabilityof writing medium after the writing instrument hasbeen held in A'an inverted or carrying position.

Other and further objects of the invention will become apparent Ifromthe description which follows taken in conjunction with the accompanyingdrawingsvin which:

Fig. 1 is a longitudinal `side elevation, partly in section showing acompleted and assembled writing instrument constructed in accordancewith the invention and showing the ink supplying cartridge positionedtherein;

Fig. 2 is a top plan view of afeed bar constructed in accordance withthe invention;

Fig. 3 is a section taken on the line -3--3 of Fig. 2;

Fig. 4 is a rear end view of the feed bar shown in Fig. 2;

Fig. 5 is 'a section taken on the line 5 5 of Fig. 4;

Fig. 6 is a longitudinal sectional view of a pen section constructed inaccordance with the invention;

Fig. 7 is a partial side elevation, in section, yandon au enlargedscale, and showing the pen section, thefeed bar and the nib of the pen,which constitute va unitary assembly in accordance with the invention,the Said unit being shown attached to the forward extremity of an inksupplying cartridge;

Fig. 8 is an enlarged fragmentary view in section, and lustratingthepenetration Iof the cartridge;

Fig. 9 is a partial view, in section, and showing the rear portion ofthe cartridge 'and the rear rportion of the barrel together Withmodified means to induce capillary ow of ink from the cartridge which isshown in inverted position.

Fig. 10 is a fragmentary top plan View of the feed bar of Fig. 2.

Referring to the drawings and more particularly to Fig. l thereof, thenumeral 16 denotes a barrel VWithin which is positioned an ink supplycartridge 20, with the rear of the cartridge 2n abutting a shoulder l1formed in the interior of the barrel 10 to limit the rearward projectionof the cartridge inthe barrel. The exterior of the forward portion ofthe barrel is provided with a threaded portion vl2 'to which aconventional cap (not shown) can be secured and the interior of theforward portion of the barrel is provided with a threaded portion 13 towhich a pen section 30 is Vsecured by means of the external threads 3lwhich are formed thereon. The rear of the barrel is vented as shown at14.

The forward end of the cartridge 2d is formed With` an externaloutwardly extending circumferential 'rib V25 and theinterior of thebarrel itil* is formed with a shoulder 1S positioned Vnear the forwardextremity thereof. Shoulder 15 is dimensioned to 'permit passage `of thecartridge While preventing passage of the outwardly extending rib on thecartridge. As a result, the cartridge 20 cannot be improperly insertedin the barrel 10.

Fitted Within the pen section Si) is a feed bar 4t) and a pen nib 5) isinterposed between the pen section 30 and the feed bar 4G. The sideflanges of the kpen n ib 50 are formed with downwardly projectingportions 51, these portions 'Si engaging indentations 1496 in the `feedbar '40 for the purpose of xing the positioh of pen nib Sti with respectto the feed bar 40.

z2,9e4,o12 Y Y Y The feed bar' 40 is shownfmore particularly in Figs. 2,3, 4 and 5 where it will be seen that the feed bar is "preferably formedof a single molded piece constituted by a forward cylindrical portion 41and a rearwardly extending semi-cylindrical portion 42. The forwardportion 41 is of conventional configuration and is shaped to deiineagrooved capillary channel 43 having grooves 44 therein, side utings 45and nib positioning indentations 46. A

Referring specifically to Figs. 4 and 5, the longitudinal axis of theforward cylindrical section 41 is coaxial with the longitudinal axis ofthe rearwardly extending semicylindrical portion 42, the common axisbeing shown Jin Pig. k5 andV identied by the numeral 47. The rearwardlyextending semi-cylindrical portion 42 is provided with capillary grooves48 in the non-cylindrical upper. surface thereof, the capillary grooves48 merging with the capillary grooves 44 near the intersection betweenthe cylindrical portions 41 and 42. The merging of the capillary grooves-48 and 44 is accomplished within the cut-out portion 49 at the rearextremity of the forward cylindrical portion 41. The capillary grooves48 slope upwardly within the cut-out portion 49 as can be best seen inFig. 5 of the drawing. Y,

The pen section of the writing instrument of the in- Vention is shownVin Fig. 6 from which it can be seen that the pen section 30 issymmetrically disposed about its central longitudinal axis 32. Theforward portion of the pen section is of conventional construction andis The rearmost extremity of the pen section 30 is formed f with atubular piercing extension 35, the rear extremity of which is preferablybeveled, e.g. cut off at an angle, to provide an enhanced piercingaction. The intermediate section of the pen section as Well as therearrnost portion thereof are provided with a cylindrical bore 36 whichis smaller in diameter than is the cylindrical bore 34 and communicatestherewith. Y

As should now be evident, and as can be seen in Fig. 1v and even moreclearly seen in Figs. 7 and 8,' the semicylindrical extension 42 tswithin the cylindrical bore 36 in the tubular piercing extension 35 andthe forward portion 41 of the feed bar 40 ts within the cylindrical bore34 in the forward portion 33 of the pen section 30.

Referring more particularly to Fig. 7, it will be seen that therearwardly extending semi-cylindrical extension 42 fits within thecylindrical bore 36 with the circular exterior of the extension l42 incontact with the wall of the cylindrical bore 36 to provide an ink-feedpassage- Way. 60 between the top grooved portion 4S of the extension 42and the interior of the cylindrical bore 36. Passageway 60 includes thespace between the interior of the bore 36 and the grooved portion 4S ofextension 42 and includes the grooves in said extension. This provides agrooved passageway.

Referring more particularly to the ink-supplying cartridge 20, and withreference to Fig. 8, the cartridge 20 istubular having side walls 21 anda forward head 22 which is thickened with respect to the walls 21. Thehead portion 22 constitutes an annular guide and de- :fines a guidingbore 23 at the rear end of which the forward extremity of the cartridge20 is closed by a thin Walled openable partition 2.4. In the preferredform shown, the partition 24 is opened by being severed by the piercingtubular extension 35 of the pen section 30 after the extension 35 haspenetrated the guiding bore 23 of the cartridge 20 to an extentsufficient to provide a 4 sealing engagement between the cylindricalextension 35 and the interiorV of the annular guide 22. As will beobserved, the semi-cylindrical extension 42 of the feed bar 40 does notinterfere with the penetration of the partition 24 of the cartridge 20by means of the tubular piercing extension 35 of the pen section 30'. Itwill further be observed that as the pen section-feed bar-nib unit isthreaded into-the barrel 10 by means of the interengaging threads 13 and311 respectively that the cartridge 20 is retained by the shoulder 11 onthe barrel 10, and rotates with the unit as the same is screwed homeinto the barrel 10 causing the tubular piercing extension 35 to bedriven throughthe guiding bore 23 of the cartridge 20. Thus, partition24 is severed after the piercing extension 35 is in sealing engagementwith the annular guide 22.

.Afterfthe writing instrument of the invention has been assembled `asaforesaid, the writing instrument is ready for writing, it beingobserved that a continuous capillary ink feed is provided between theinterior of the cartridge 20 and the pen nib 50, this capillary feedbeing constituted by the grooved passageway 6i), the grooved cut-out 49'and the grooved channel 43 formed in the forward cylindrical portion 41of the feed bar 40, this latter grooved channel immediately underlyingthe pen nib 50 as can be seen in Fig. 7. Y

It is desired to point out that the cut-out 49 functions as anintermediate ink feed reservoir and insures instant writing after thepen has been maintained in an inverted or carrying position, e.g. withthe nib thereof pointed upwardly. Thus, after the pen has been used forwriting, the intermediate reservoir constituted by cut-out 49 is filledwith liquid writing uid which cannot return to the cartridge through thegrooved capillary passageway 6l) when the writing instrument isinverted.

When the writing instrument is rst assembled, the passageway 60, thecut-out 49 and the capillary-channel 43 are devoid of liquid writingmedium and there is a tendency for the liquid writing medium in thecartridge to become air-bound therein. Additionally, there is a lessertendency for the portions of the pen section and feed bar which extendinto the cartridge to dry when the writing instrument is inverted.Again, there may be some difculty in initiating the capillary flow ofliquid writing medium om the cartridge. As previously indicated, thepresence of the intermediate reservoir constituted by cut-out 49material reduces this last named difculty since slome writing medium isimmediately available and time is provided and also Writing agitation)for the establishment of capillary dow. Y A

In any event, it is desirable, though not essential, to provide meanswithin the cartridge to establish a capillary continuity between theportions of the feed bar and pen section which protrude into thecartridge and the liquid writing medium contained therewithin.

For this purpose a movable member having a density greater than thewriting medium is positioned within the cartridge before the rear endthereof is capped to seal the Writing medium therewithin. Naturally, themovable member is constructed fof a material which is not subject to inkcorrosion.

Referring to Fig. l, a wire member 70 is slidably mounted within thecartridge, the member 7@ having a straight central portion and ring-likeforward and rear extremities. In Fig. 1, the writing instrument isinverted and the wire mmber 70 is in an inoperative position. The Wiremay be of metal or plastic.

Referring to Fig. 9, the movable means is constituted by the ball orsphere 71. When the writing instrument is placed in Writing position,the sphere 71 sinks in the writing medium and contacts the protrudingportions of the feed bar and pen section to initiate capillary flow ofwriting medium from the cartridge.

When the cartridge has become exhausted through use, the pen section 30can be grasped and unscrewed from the barrel 10. It will be observedthat as the pen section 30 is rotated, the .cartridge 20 will remainsecured to the tubular piercing extension 3S and will rotate with thepen section 30 until the pen section 30 with the attached cartridge 20is freed from the barrel 10 at which time the cartridge 20 can beextracted from the barrel 10 by the simple operation of withdrawing thefreed pen section 30 from the forward end of the barrel 10. The pensection 30 with the cartridge 20 secured thereto can then be removed toa convenient location where the cartridge 20 can be withdrawn from thetubular piercing extension 35 and disposed of without any danger ofsoilage.

When the exhausted cartridge unit is disposed of, a fresh cartridge 20is inserted in the barrel 10 and the pen section unit screwed home uponthe barrel as previously described to enable the writing operation tocontinue.

To specifically illustrate a preferred construction, but without anyintention of limiting the invention, the rear portion 42 of the feed bar40 can have a length of 0.407 and a diameter of 0.090. The distancebetween the bottom of the rearwardly extending portion 42 and thenoncylindrical upper surface is 0.062-0.065" and the grooves 43 thereinhave a width of 0.010 and a depth of 0.030". The grooves 48 widen at theforward extremity 48' of the portion 42 to a width of 0.015. The grooves44 in the cut-out 49 have a width of 0.015 and a depth of 0.030 (thesame as the depth of the grooves 48).

The slope of the bottom wall of the cut-out 49 is 15 degrees and thecapillary channel 43 has a width of 0.053 and a depth of 0.018 and thegrooves therein have a width :of 0.015 and a depth of 0.010".

The rearwardly extending portion 42 of the feed bar 40 lis disposedwithin the bore 36 of the pen section 30. This bore 36 has a diameter of0.0930.094" and a total length of 0.469. The external diameter of thepiercing extension 35 of the pen section 30 is 0.139- 0.l40" and alength of 0.050. The rear of the piercing extension 35 is beveled at anangle of 25 degrees.

Throughout the specification and claims the word cylindrical is used inthe normal sense meaning a circular cylinder. lt is also apparent fromthe illustrative relative dimensions given above that the portion 42 isnot precisely a semi-cylinder since its diameter is 0.090" and thedistance between the bottom and the upper surface is 0.0620.065 or morethan half the diameter. Therefore, the terms semi-cylinder andsemi-cylindrical are used in a loose sense meaning a longitudinalportion of a circular cylinder having a circular or cylindrical surfaceand a non-cylindrical surface.

As can be seen from the above illustration, it is preferred to form thegrooves 48 in the rearwardly extending portion 42 so that these groovesare narrower and deeper than the ylongitudinal grooves in the capillarychannel 43. As a result, there is a reduced tendency to lose liquidwriting medium from the intermediate reservoir constituted by cut-out 49when the writing instrument is inverted. Moreover, flow of liquidwriting medium is controlled by the narrow and deep grooves 48 andprevention of ooding is further insured.

It wil-l be appreciated that the present invention is in no waydependent upon the particular manner in which the pen nib 50 is xed withrespect to the feed bar 40 or upon the manner in which the feed bar ispositioned with respect to the pen section 30.

It is desired to point out that the specific construction disclosed inthe accompanying drawings is simply illustrative and many variationswill be immediately apparent to those skilled in the art. To illustrate,the mounting of the nib 50 with respect to the feed bar 4.0 and theforward end of the pen section 30 is subject to considerable variation.For example, Ilugs 51 and recesses 46 may be eliminated and the pen nibmay be xed to the feed bar in other known manners, or not xedlypositioned with respect thereto. Further, the feed bar 40 is shown asbeing mounted in the pen 'section 30 in a manner permitting rotation ofthe feed bar. This is not at all necessary and these parts may beconstructed in a manner requiring a particular position of the feed barwith respect to the pen section. Also, the pen section may be providedwith a hood projecting from the lower end of the bushing. The pen nibmay also be provided with a guard. Many other similar variations will`also be evident to those skilled in the art.

Ne claim:

'1. A unitary pen assembly adapted for use in a writing instrumentutilizing a replaceable liquid writing fluid containing cartridge as thesource of writing medium comprising a pen section having a forwardportion of enlarged diameter having a large diameter feed bar receivingbore therethrough, said pen section having a reduced diameter rearwardlyextending tubular extension positioned at the rear of said forwardportion, said tubular extension having a small diameter boretherethrough communicating with said feed bar receiving bore `andextending through said extension to 'the rear face thereof to providesaid extension with an open rear face, a feed bar having a forwardportion fitted within said feed bar receiving bore, the .forward portionof said feed bar defining a capii'lary channel extending longitudinallythereof, said feed bar having a rearwardly extending portion of reduceddiameter projecting from the rear of the forward portion of said feedbar `and fitted within said tubular extension, said rearwardly extendingportion extending to adjacent said open rear face, said rearwardlyextending portion of said feed bar having a longitudinal surface spacedfrom the inner wall of said tubular extension with said surface havingtherein at least one longitudinal groove, said longitudinal groove andthe space between the inner wall or said tubular extension and saidlongitudinal surface together defining `a grooved longitudinalpassageway, said space being substantially the only Space between theinner wall of the tubular extension and the rearwardly extending portionof the feed bar, said capillary channel and said passageway being incommunication with each other at the rear of the forward portion of saidfeed bar, and a pen nib interposed between said feed bar Iand said pensection adjacent said capillary channel.

2. A pen assembly as recited in claim 1 in which said tubular extensionof said pen section, the bores in said pen section and the forwardextending portions of said feed bar are cylindrical, and the rearwardlyextending portion of said feed bar is semi-cylindrical.

3. A pen assembly as recited -in claim 1 in which the rear of theforward portion of said feed bar defines a cutout extending between saidpassa eway `and said capillary channel.

4. A pen assembly as recited in claim 3 in which said capillary channeland cut-out `are longitudinally grooved with the grooves of saidpassageway, cut-out and capililary channel merging to provide acontinuous grooved ink feed extending from the rear of said passagewayto the forward extremity of said capillary channel the groove of saidpassageway being narrower and deeper than the grooves of said capillarychannel.

5. A writing instrument comprising a barrel having an open forwardextremity, a replaceable liquid writing uid containing cartridge havinga forward `annular guide portion and an openable partition therebehind,said partition normally closing said cartridge to retain said liquidwriting fluid therewithin, said cartridge being slidably positionedwithin said'barrel with the rearward projection of the cartridge in saidbarrel being limited, a pen section having a forward portion of enlargeddiameter having a large diameter feed bar receiving bore therethrough,said pen section being threadedly engaged with the forward extremity ofsaid barrel, said pen section having a reduced diameter rearwardlyprojecting tubular extension positioned at the rear of said forwardportion, said tubular extension Abeing vin sliding sealing engagementwith -7 the interior of said forward annular guide portion, said tubularextension having a 'small diameter bore therethrough communicating withsaid feed bar receiving bore .and extending through said extension tothe rear face thereof to provide said extension with an open rear face,a feed bar having a forward portion fitted within said feed barreceiving bore, said feed bar having a rearwardly extending portion ofreduced diameter projecting from -the rear of the forward portion ofsaid feed bar and fitted within said tubular extension, said rearwardlyextending .portion extending to adjacent said open rear face, said feedbar defining a capillary channel extending longitudinally thereof to therear of said rearwardly extending portion to communicate with said openrear face, and a pen nib interposed between said feed bar and said pensection adjacent said capillary channel, said tubular extension beingbeveled at its rearmost extremity, said bevel being positioned withinsaid forward annular guide portion of said cartridge, said beveldefining a piercing edge so that when said pen section is moved laxiallytoward the rear of said barrel, said piercing edge is urged toward Asaidopenable partition to pierce said partition and provide directcommunication between the interior of said cartridge and said open rearface.

. 6. A writing instrument as recited in claim in which said cartridge-is provided with an external, outwardly extending rib at the forwardend thereof and the interior of said barrel is formed with a shoulderpositioned near the forward extremity of said barrel and dimensioned topermit passage of said cartridge and prevent passage of said ribbedforward end.

7. A writing instrument as recited in claim 5 in which movable meanshaving a density greater than the writing medium is positioned withinsaid cartridge to insure the capillary ow of liquid writing medium fromthe cartridge.

8. A writing instrument as recited in claim 7 in which said movablemeans is constituted by a wire member having a ring-like forwardextremity.

9. A writing instrument as recited in claim 5 in which said tubularextension is centrally positioned with respect to said threadedengagement, said tubular extension and the bore therein beingcylindrical, the rearwardly extending portion of said feed bar beingsemi-cylindrical With the non-cylindrical surface thereof havinglongitudinal grooves formed therein, and the rear of the forward portionof said feed bar defines an intermediate reservoir constituted by acut-out extending between said passage- Way and said capillary channel,said capillary channel and said cut-out being longitudinally groovedwith the grooves in said passageway, cut-out, and capillary channelmerging to provide a continuous grooved ink feed, the grooves of saidpassageway being narrower and deeper Vthan the grooves of said capillarychannel.

10. A feed bar comprising a forward cylindrical portion provided with alongitudinally extending capillary channel comprising at least onegroove, the `rear of said forward portion defining a cut-outcommunicating with the rear termination of said capillary channel andterminating at a point on the rear face of said forward portionintermediate said capillary channel and the longitudinal axis of saidforward portion, a rearwardly extending portion, integral with theforward portion, of smaller diameter than said forward portion, saidrearwardly extending portion being semi-cylindrical with thenon-cylindrical surface having therein at least one longitudinalcapillary groove, the bottom of said cut-out being provided with atleast one groove communicating with a groove in said non-cylindricalsurface, the groove in said non-cylindrical surface being narrower anddeeper than the groove of said capillary channel.

11. A feed bar as recited in claim 10 in which said forward portion andsaid rearwardly extending portion have a common longitudinal axis.

. .12. A unitarypen assembly as recited in claim 11 in which saidtubular extension is beveled Iat its rearmost extremity.

13. A unitary pen assembly adapted for use in a writing instrumentutilizing a replaceable liquid writing fluid containing cartridge as thesource of Writing medium comprising a pen section having a forwardportion of enlarged diameter having a large diameter feed bar receivingbore therethrough, said pen section having a reduced diameter rearwardlyprojecting tubular extension positioned at the rear of said forwardportion, said tubular extension having a small diameter boretherethrough communicating with said feed bar receiving bore andextending through said extension to the rear face thereof to providesaid extension with an open rear face, a feed vbar having a forwardportion fitted within said feed bar receiving bore, said feed bar havinga rearwardly extending portion projecting from the rear of the forwardportion of said feed lbar and fitted within said tubular extension, saidrearwardly extending portion extending to adjacent said open rear-face,said feed bar defining a longitudinally extending capillary channel,said channel extending to the rear of said rearwardly extending portionof said feed bar and communicating with said open rear face, the tubularextension being beveled at its rearmost extremity to provide a piercingedge for piercing a closure on said cartridge, and a pen nib interposedbetween said feed bar and said pen section adjacent said capillarychannel.

14. A unitary pen assembly adapted for use in a writing instrumentutilizing a replaceable liquid writing fluid containing cartridge as thesource of writing medium comprising a pen section having a forwardportion of enlarged diameter having a large diameter feed bar receivingbore therethrough, said pen section having a reduced diameter rearwardlyextending tubular extension positioned at the rear of said forwardportion, said tubular extension having a small diameter boretherethrough communicating with said feed bar receiving bore andextending through said extension to the rear face thereof to providesaid extension with an open rear face, a feed bar having a forwardportion fitted within said feed bar receiving bore, the forward portionof said feed bar defining a capillary channel extending longitudinallythereof, said feed bar having a rearwardly extending portion of reduceddiameter projecting from the rear of the forward portion of said feedbar and fitted within said tubular extension, said rearwardly extendingportion extending to adjacent said open rear face, said rearwardlyextending portion of said feed bar having a longitudinal surface spacedfrom the inner wall of said tubular extension with said surface havingtherein at least one longitudinal groove, said longitudinal groove andthe space between the inner wall of said tubular extension and saidlongitudinal surface together defining a grooved longitudinalpassageway, said rearwardly extending portion being of uniform crosssection, said capillary channel and said passageway being incommunication with each other at the rear of theforward portion of saidfeed bar, and a pen nib interposed between said feed bar and said pensection adjacent said capillary channel.

References Cited in the le of this patent UNITED STATES PATENTS1,724,106 Pollock Aug. 13, 1929 1,724,107 Pollock Aug. 13, 19291,762,554 Hume June 10, 1930 1,783,681 Terry Dec. 2, 1930 2,736,292Tanberg Feb. 28, 1956 2,748,749 Palsic June 5, 1956 FOREIGN PATENTS1,071,648 France Mar. 10, 1954 708,633 Great Britain May 5, 1954 728,188Great Britain Apr, 13, 1955

